I can confirm the same bug in CPU-Z v1.60.1 that Arctucas has.
When I ran this new CPU-Z update this morning I was puzzled when it showed my BCLK as 180 MHz, my Multiplier as 20x and my RAM running at 720 MHz (1,440 MHz effective) when the BIOS and POST, as well as SIW and AIDA64, show the correct (IMO) BCLK of 200 MHz, Multiplier of 18x and RAM speed of 800 MHz (1,600 MHz effective). I also confirmed these settings by running v1.59 of CPU-Z!
Oddly, these misreported readings are actually the previous settings I was using until I increased my memory from 2 x 3 GB 1,333 MHz sticks to 3 x 4 GB 1,600 MHz ones. I have a Core i7-920 clocked at 3.6 GHz on an ASUS P6T Deluxe motherboard, running the most up to date BIOS, v2209.